CN102218821B - Blow film type processing equipment for heat-sealing of drip irrigation pipe in vacuum - Google Patents

Abstract

The purpose of the present invention is to provide a film blowing vacuum heat-sealed drip irrigation belt processing equipment, which is composed of extruder I, extruder II and extruder III blown film machine, set in three-layer composite blown 3 to 5 pairs of herringbone nip rollers (21) installed symmetrically with respect to the center line of the film bubble at the rear of the film die (6), flexible pressure rollers and water-cooled vacuum forming rollers arranged behind the nip rollers, and sequentially arranged on the forming The tension roller behind the station, the slitting knife arranged between the tension rollers, the flattening wheel and the winding shaft arranged behind the slitting station, the invention can form 12-24 pieces at the same time on the same equipment and the same production line Strip drip irrigation belt, which greatly improves production efficiency and reduces the production cost of drip irrigation belt. The extruded drip irrigation belt is composed of three layers of film, which can make the inner layer of the drip irrigation belt suitable for high-speed heat sealing process, smooth and non-scaling. The middle layer improves blast resistance, flexibility, and tensile strength, and the outer layer improves puncture resistance, opacity, and anti-aging performance. The quality is easier to control to meet the market demand of my country's water-saving irrigation by leaps and bounds.

Description

A processing equipment for blown film vacuum heat-sealed drip irrigation belt

technical field

The invention relates to a film-blown vacuum heat-sealed drip irrigation belt processing equipment, which belongs to the technical field of agricultural water-saving irrigation equipment.

Background technique

Drip irrigation is the most water-saving irrigation technology. The drip irrigation belt is one of the main drip irrigation components. Through the labyrinth flow channel on it, the pressure water flow can be changed into small flow water droplets or trickles that slowly drip or flow out. However, at present, due to the high investment in the early stage, the application of this technology is limited in the vast rural areas, especially the poor areas with drought and water shortage. At present, the commonly used method of forming the labyrinth channel of the drip irrigation belt is mainly the vacuum suction method: first, a thin-walled cylinder is continuously extruded by the extruder, and the extruded thin-walled tube is flattened during the upward stretching process in the semi-molten state. Before cooling, the thin-walled plastic tube is pressed into the shape of the labyrinth flow channel by the forming wheel, and the labyrinth flow channel is sucked out by vacuum suction, and then cut into two drip irrigation belts with a labyrinth on one side. This production method and equipment can press up to 2 drip irrigation belts once, and the production efficiency is relatively low. In 2007, the applicant disclosed a production equipment for simultaneous and continuous production of multiple patch labyrinth flow channel drip irrigation belts. (200710061763.7) first proposed a technical solution for a group of equipment to simultaneously press and form multiple drip irrigation belts in the industry. , but how to improve the production efficiency of the drip irrigation belt and reduce the system investment is still a bottleneck problem that restricts the popularization of the drip irrigation belt to the countryside.

Contents of the invention

The purpose of the present invention is to provide a supporting equipment for forming multiple drip irrigation belts at the same time, in order to greatly improve the production efficiency of drip irrigation belts, and solve the problem that the production cost of drip irrigation belts is high and farmers cannot afford them.

The technical scheme of the present invention is realized in this way: the processing equipment of this blown film type vacuum heat-seal drip irrigation belt, this equipment is composed of extruder I, extruder II and extruder III blown film machine, set in 3 to 5 pairs of herringbone nip rollers installed symmetrically with respect to the center line of the film bubble above the three-layer composite blown film die head, flexible pressure rollers and water-cooled vacuum forming rollers arranged above the nip rollers, and sequentially arranged at the forming station The tension roller at the rear, the cutting knife arranged between the tension rollers, the flattening wheel and the winding shaft arranged behind the cutting station.

The water-cooled vacuum forming roll is composed of a rotating forming wheel set on a fixed hollow shaft, a fixed water jacket is arranged around the hollow shaft to form a cold water chamber, and a vacuum chamber is axially arranged between the hollow shaft and the rotating forming wheel. The end face ratchet of the wheel meshes with the end face ratchet of the rotary forming wheel, driving the rotary forming wheel to rotate around the fixed water jacket. the

The processing equipment for the blown film vacuum heat-sealed drip irrigation belt, the outer surface of the rotary forming wheel is provided with annular ribs at fixed intervals along the axial direction, annular grooves and evenly distributed air extraction through holes, and the inner surface of the annular groove An annular labyrinth forming ring with a rectangular cross section is inlaid, and after the rotating forming wheel is inlaid with the labyrinth forming ring, the outer diameter of the forming ring is the same as the outer diameter of the annular rib.

The processing equipment for the film-blowing vacuum heat-sealed drip irrigation belt, the outer surface of each forming ring is engraved with N groups of equidistant labyrinth grooves along the circumferential direction, and the shape of the labyrinth grooves is designed according to the hydraulic performance requirements. The labyrinth pumping hole is set at the bottom to communicate with the pumping hole of the rotary forming wheel. When the pumping hole rotates to the position of the vacuum chamber of the water-cooled shaft, a vacuum condition is formed, and the rotary molding between the annular rib and the labyrinth forming ring On the outer surface of the wheel, the water passage of the drip irrigation tape is sucked out, and the water outlet labyrinth is sucked out at the labyrinth groove, and at the same time, the annular convex rib and the convex part of the annular labyrinth forming ring are pressed against the drip irrigation tape.

In the processing equipment for blown-film vacuum heat-sealed drip irrigation tape, the air pumping holes provided on the rotary forming wheel are larger than the labyrinth air pumping holes provided on the labyrinth forming ring.

In the processing equipment for blown-film vacuum heat-sealed drip irrigation tape, the vacuum chamber is connected to the hollow shaft through the exhaust transition pipe, one end of the hollow shaft is blocked, and the other end is connected to the air extraction port, and the air extraction port passes through the vacuum exhaust pipe, vacuum exhaust The valve is connected to a vacuum pump.

In the processing equipment for film blown vacuum heat-sealed drip irrigation tape, other parts of the inner surface of the rotary forming wheel are isolated from the vacuum chamber, do not form a vacuum condition, and are in contact with the fixed hollow shaft.

In the processing equipment for blown-film vacuum heat-sealed drip irrigation belt, the fixed hollow shaft and the end cover form a cold water cavity, and the cooling water inlet and outlet are arranged on the end cover.

In the processing equipment for blown-film vacuum heat-sealed drip irrigation tape, the cutting blade forms an included angle of 100-120 degrees with the top of the drip irrigation tape.

In the processing equipment for film-blown vacuum heat-sealed drip irrigation tape, the outlet gap of the die head is set to be eccentric, so that the blown film has a thickness difference, which is convenient for the water-cooled vacuum forming roller 10 to vacuum on the relatively thick plastic sheet. The water passage and water outlet maze of multiple drip irrigation belts are formed by suction.

Since the present invention adopts the technical scheme of continuously extruding drip irrigation tapes in the same equipment, 12-24 drip irrigation tapes can be formed simultaneously on the same production line, and the extruded drip irrigation tapes are composed of three layers of films, which can make the drip irrigation tapes The inner layer is suitable for high-speed heat sealing process, smooth and non-scaling, the middle layer improves blast resistance, flexibility, and tensile strength, and the outer layer improves puncture resistance, opacity, and anti-aging performance. The unit production capacity is three times that of an extruder, and there is only one set of drip irrigation belt forming device and other auxiliary equipment, the unit cost is low, and the energy consumption of auxiliary equipment is low. It is easier to meet the market demand of my country's water-saving irrigation by leaps and bounds.

Description of drawings

Figure 1: Schematic diagram of blown film vacuum heat-sealed drip irrigation belt processing equipment

Figure 2: is a top view of Figure 1

Figure 3: A-A view of Figure 1

Figure 4: It is a partial enlarged cross-sectional view of B in Figure 1

Figure 5: is the top view of Figure 4

Figure 6: Schematic diagram of the structure of the water-cooled vacuum forming roller

Figure 7: It is the A-A sectional view of Figure 6

Figure 8: It is the B-B sectional view of Figure 6

Figure 9: It is a partial enlarged view of C in Figure 6

Figure 10: is the D-direction view of Figure 6

Figure 11: It is the E-direction view of Figure 6

Figure 12: It is a partial enlarged view of F in Figure 10

Figure 13: It is a cross-sectional view of the drip irrigation belt formed at the G position of Figure 12

Figure 1-5 Processing equipment icon description:

1. Extruder screw pulley 2. Extruder upper hopper 3. Extruder barrel

4. Extruder chassis 5. Extruder barrel heater

6. Three-layer composite blown film die head 6-1. Die opening gap adjustment ring 6-2. Die opening inner core

6-3. Compressed air inlet 6-4. Die opening fixing ring 6-5. Die opening outer ring

6-6. Bubble outer layer feed port 6-7. Die split ring A 6-8. Bubble inner layer feed port

6-9, Die opening splitter ring B 6-10, Film bubble middle layer feed port 6-11, Die opening fixing seat

6-12. Die gap adjustment screw

7. Cylinder 8. Flexible pressure roller 9. Adhesive forming uncut drip irrigation belt

10. Water-cooled vacuum forming roll 11. Tension roll A 12. Tension roll B 13. Tension roll C

14. Flattening roller 15. Winding shaft 16. Drive motor pulley 17. Drive belt

18. Divided drip irrigation tape 19. Cutting knife 20. Three-layer composite plastic film bubble

21. Herringbone pinch roller group 22. Cutter shaft 23. Vacuum exhaust pipe 24. Return water pipe

25. Water inlet pipe 26. Water inlet control valve 27. Exhaust valve 28. Air extraction valve

29. Cooling water tank 30. Vacuum pump 31. Extruder Ⅰ 32. Extruder Ⅱ

33. Extruder III 34. Compressed air pump 35. Compressed air pipeline

36. Compressed air valve 37. Cooling air ring 37-1. Cooling air inlet

37-2 Upper port of cooling air ring 37-3, Lower port of cooling air ring 38, Compressed air inlet

Figure 6~Figure 12 Description of water-cooled vacuum forming roller icons:

10-1. Air suction port 10-2. Lock nut A 10-3. Water inlet 10-3-1. Water inlet

10-3-2, water outlet 10-4, end cover A 10-5, labyrinth forming ring

10-5-3, labyrinth groove 10-5-1, 10-5-2, air extraction through hole

10-6, annular convex rib 10-7, cold water chamber 10-8, excessive suction pipe

10-9. Fixed water jacket 10-9-1. Water-cooled shaft vacuum chamber 10-10. Rotary forming wheel

10-11, hollow shaft 10-12, end cover B 10-13, lock nut B

10-14, drive sprocket 10-15, bearing 10-16, snap ring 10-17, fixed shaft seat

Figure 13 Icon Description

a is the labyrinth of the drip irrigation tape, b is the water passage of the drip irrigation tape, and c is the adhesive part of the drip irrigation tape.

Detailed ways

The processing method and equipment working principle schematic diagram of blown film type vacuum heat-seal drip irrigation belt shown in Fig. 1～5, the working principle of the present invention is that three plastic extruders feed material to blown film film mouth simultaneously, blow out composite plastic film, in plastic The water passages and water outlet mazes of multiple groups of drip irrigation belts are formed on the film at the same time, and are cut into multiple drip irrigation belts online.

A special processing equipment for film-blown vacuum heat-sealed drip irrigation tape, as shown in Figures 1 to 5. This equipment is a film blowing machine composed of extruder I, extruder II and extruder III, and 3 to 5 pairs of herringbone symmetrically installed relative to the center line of the film bubble are arranged above the three-layer composite blown film die head 6. Type nip roller group 21, flexible pressure roller 8 and water-cooled vacuum forming roller 10 arranged above the extrusion die, and tension rollers 11, 12, 13 arranged in turn behind the forming station, arranged between the tension rollers The slitting knife 19 is composed of the flattening wheel 14 and the winding shaft 15 arranged at the slitting station rear.

The present invention also includes setting the die outlet gap to be eccentric, so that the blown film produces a thickness difference, which is convenient for the water-cooled vacuum forming roller 10 to vacuum-form the water passage and the water outlet labyrinth of a plurality of drip irrigation belts on a relatively thick plastic sheet. .

The key component and innovative point of this processing equipment is the water-cooled vacuum forming roll 10 shown in Figures 6-12, which is composed of a rotating forming wheel 10-10 set on a fixed hollow shaft 10-11, and a fixed water jacket is arranged around the hollow shaft 10-9 constitutes a cold water chamber 10-7, and a vacuum chamber 10-9-1 is arranged axially between the hollow shaft and the rotary forming wheel. Engagement drives the rotary forming wheel 10-10 to rotate on the axis of the fixed water jacket 10-9. As shown in Figure 8. the

The outer surface of the rotary forming wheel 10-10 is axially provided with annular ribs 10-6 at fixed intervals, annular grooves and evenly distributed air extraction through holes 10-5-2, as shown in Fig. 9, Fig. 10 and Fig. 12 An annular labyrinth forming ring 10-5 with a rectangular cross section is embedded in the annular groove, and the outer surface of each forming ring is engraved with N sets of labyrinth grooves 10-5-3 at equal intervals along the circumference, and the bottom of the groove is set with a diameter of 0.5 to The 0.6mm labyrinth air extraction holes 10-5-1 communicate with the larger air extraction holes 10-5-2 uniformly distributed on the circumference of the rotary forming wheel, and the diameter of the air extraction holes 10-5-2 is 2-3mm. The hole spacing is 10-12mm. When the air pumping through hole 10-5-2 is rotated to the position of the vacuum chamber 10-9-1 of the water cooling shaft, the vacuum condition is formed, and the rotating forming wheel between the annular rib 10-6 and the labyrinth forming ring 10-5 On the surface, pump out the water passage 10-5-5 of the drip irrigation belt, and pump out the water outlet labyrinth at the labyrinth groove 10-5-3, and at the same time, the annular convex rib 10-6 and the convex part of the annular labyrinth forming ring 10-5 Press the semi-molten drip irrigation tape with the flexible pressure roller.

Other parts of the inner surface of the rotary forming wheel 10-10 are isolated from the vacuum chamber 10-9-1, without forming a vacuum condition, and are in contact with the surface of the outer diameter of the fixed hollow shaft. The forming wheel cools down quickly.

The labyrinth groove 10-5-3 of the labyrinth forming ring 10-5 can be carved into any shape according to hydraulic performance requirements. After rotating the forming wheel 10-10 to inlay the labyrinth forming ring, the outer diameter of the forming ring is the same as the outer diameter of the annular rib.

Vacuum chamber 10-9-1 shown in Fig. 7 is connected with hollow shaft 10-11 through pumping transition pipe 10-8, and one end of hollow shaft is blocked, and one end connects pumping port 10-1, and pumping port passes through vacuum pumping pipe 23, vacuum The exhaust valve 28 is connected with a vacuum pump 30 .

As shown in Figure 11, the fixed hollow shaft 10-11, the fixed water jacket 10-9 and the end covers 10-4 and 10-12 constitute the cold water cavity 10-7, and the cooling water inlet 10-3-1 and the outlet of the cooling water are arranged on the end cover. Nozzle 10-3-2.

In the processing equipment for film-blown vacuum heat-sealed drip irrigation tape, the 19 blades of the cutting knife form an angle of 100-120 degrees with the top of the plastic sheet.

When the equipment is installed, the outer circle of the flexible pressure roller is tangent to the center of the vacuum chamber of the water-cooled sleeve of the forming roller at 10-12 degrees clockwise.

The working principle of this blown film vacuum heat-sealed drip irrigation belt processing equipment includes:

A. Ingredients: After mixing the raw materials according to the weight ratio, fill them into the hoppers of extruder I31, extruder II32, and extruder III33;

B. Extrusion: Extrude three kinds of semi-molten plastic bubbles with different materials and colors, and compound them at the die to form a three-layer composite bubble 20;

C. Film blowing: adjust the gap at the outlet of the film blowing die 6 to blow out the film bubble, and pull it upward so that the extruded film bubble is gradually flattened from a circle through the herringbone nip roller group 21, and becomes two sheets connected together on the sides ;

The specific operation is to pass the double-layer sheet through the gap between the flexible pressure roller 8 and the water-cooled vacuum forming roller 10 as shown in Fig. on the shaft 15; then increase the compressed air valve to inflate the film bubble.

D. Drip irrigation tape forming: The two sheets connected together on the sides obtained in step C are pulled through the gap between the flexible pressure roller 8 and the water-cooled vacuum forming roller 10, and under the action of pressing and cooling the flexible pressure roller and the forming roller, one side Quickly press the parts of the two layers of semi-molten plastic sheets that need to be bonded together, and at the same time rely on vacuum suction to form multiple water passages and water outlet labyrinths for the drip irrigation belt;

E. Slitting: Cut the formed whole plastic sheet into a single drip irrigation belt after being stretched by the tensioning rollers 11, 12, 13, then pass through the flattening roller 14, and then wind it on the winding shaft 15, so that after cutting Each drip irrigation belt is fully flattened.

The above description is only proposed as a technical solution that can be implemented by the processing method and equipment of a film-blown vacuum heat-sealed drip irrigation belt according to the present invention, and is not used as a restriction on its structure or technology.

Claims (7)

1. the process equipment of a film-blowing type vacuum heat-sealing drip irrigation tapes, it is characterized in that, this equipment is by the extruder I, the inflation film manufacturing machine that extruder II and extruder III form, be arranged at 3～5 pairs of symmetrical chevron shaped nip rolls groups (21) of installing of relative film bubble center line of three layers of compound film-blowing die head (6) top, be arranged at flexible compression roller (8) and the water-cooling vacuum forming roller (10) of nip rolls top, and the idler roller A(11 that is set in turn in the shaping station rear), idler roller B(12), idler roller C(13), be arranged at the segmentation knife (19) between idler roller A and idler roller B, be arranged at flattening wheel (14) and winding axle (15) composition at cutting station rear,

Described water-cooling vacuum forming roller (10) is sleeved on fixation hollow axle (10-11) by rotational forming wheel (10-10) and forms, arranging fixedly around hollow shaft, water jacket (10-9) consists of cold water cavity (10-7), axially be provided with vacuum chamber (10-9-1) between hollow shaft and rotational forming wheel, during work, end face ratchet by sprocket wheel (10-14) and rotational forming wheel end face ratchet engagement, driven rotary briquetting roller (10-10) is take fixing water jacket (10-9) as the axle rotation;

Described rotational forming wheel (10-10) outer surface arranges the annular ridge (10-6) of constant spacing vertically, annular groove and the uniform through hole of bleeding (10-5-2), inlaying cross section in annular groove is the annular labyrinth forming ring (10-5) of rectangle, after rotational forming wheel (10-10) was inlayed the labyrinth forming ring, the forming ring external diameter was identical with the annular ridge external diameter;

Bias is arranged in described die head exit gap, makes the film that blows out produce difference in thickness.

2. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 1, it is characterized in that, described every forming ring outer surface along the circumferential direction is carved with N group equally spaced labyrinth groove (10-5-3), the labyrinth groove is by hydraulic performance requirement design shape, the labyrinth bottom portion of groove arranges the bleed through hole of bleeding (10-5-2) of through hole (10-5-1) and rotational forming wheel of labyrinth and is communicated with, bleed when rotational forming wheel and form vacuum condition when through hole rotates to vacuum chamber (10-9-1) position of water-cooling shaft, rotational forming wheel outer surface between annular ridge (10-6) and labyrinth forming ring (10-5), aspirate out the drip irrigation zone and cross aquaporin (10-5-5), (10-5-3) locates to aspirate out water maze at the labyrinth groove, while annular ridge (10-6) and annular labyrinth forming ring (10-5) bossing pressing drip irrigation zone.

3. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 1, is characterized in that, the upper through hole of bleeding (10-5-2) that arranges of described rotational forming wheel is greater than the labyrinth of the labyrinth forming ring setting through hole (10-5-1) of bleeding.

4. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 1, it is characterized in that, described vacuum chamber (10-9-1) is connected with hollow shaft (10-11) by the transition conduit of bleeding (10-8), hollow shaft one end blocks, one end connects bleeding point (10-1), and bleeding point is connected with vavuum pump (30) by vacuum exhaust pipe (23), vacuum extraction valve (28).

5. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 4, it is characterized in that, described rotational forming wheel other position of (10-10) inner surface and vacuum chamber (10-9-1) isolation do not form vacuum condition, and contact with fixation hollow axle (10-11).

6. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 1, it is characterized in that, described fixation hollow axle (10-11) consists of cold water cavity (10-7) with end cap (10-4,10-12), and cooling water intake (10-3-1) and delivery port (10-3-2) are set on end cap.

7. the process equipment of film-blowing type vacuum heat-sealing drip irrigation tapes according to claim 1, is characterized in that, described segmentation knife (19) sword with become above the drip irrigation zone 100～120 the degree angles.

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